Access Violation in Asynchronous Agents Pipeline Application

Question

i have an application use agent to implements simple image processing pipeline

i have three agents

1. Load Bitmap Agent and this its run function 
   

   void CLoadBitmapAgent::run()
   {
   	Bitmap *pSourceBitmap = new Bitmap(m_imagePath);
   	asend(m_target,pSourceBitmap);
   	done();
   }
   

2. Convert to Gray Agent and this is its run function
   

   void CConvertToGrayAgent::run()
   {
   	BitmapUtilities bitmapUtilities;
   	Bitmap *pSourceBitmap = receive(m_source);
   	bitmapUtilities.ParallelConvertToGray(pSourceBitmap);
   	asend(m_target,pSourceBitmap);
   	done();
   
   }

3. Save Bitmap Agent and also its run function as follow
   

   void CSaveBitmapAgent::run()
   {
   	Bitmap * bitmap = receive(m_source);
   	BitmapUtilities bitmapUtilities;
   	CLSID clsid; 
   	bitmapUtilities.GetEncoderClsid(L"image/jpeg",clsid);
   	bitmap->Save(L"D:\\final_image.jpg",&clsid);
   	done();
   }
   

   
   i get access violation exception and i don't know why
   i'm taking my first steps on parallel computing so i don't know how to solve it
   
   you can get app from this link
   https://skydrive.live.com/#cid=068215710BEF663D&id=68215710BEF663D!147
   ImageProcessingPipeline Application
   thanks so much

Answer 1

Hi Ma7moud El-Naggar,

    the AV is because of incorrect params (count) to agent::wait_for_all function in image_processing_pipline_main.cpp. It needs to be the following:

agent* agents[3] = {&loadBitmapAgent,&convertToGrayAgent,&saveBitmapAgent};

agent::wait_for_all(3,agents);

Thanks,

Vinod.